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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Aug. 31, 2011
Fair Value Measurements      
Total losses $ 7,500 $ 7,507  
Property, plant and equipment, net 46,642 46,642 51,804
Nonrecurring basis
     
Fair Value Measurements      
Total losses   7,507  
Nonrecurring basis | Before Fair Value Adjustment
     
Fair Value Measurements      
Property, plant and equipment, net 54,000 54,000  
Nonrecurring basis | Total
     
Fair Value Measurements      
Property, plant and equipment 46,450 46,450  
Nonrecurring basis | Significant unobservable inputs (Level 3)
     
Fair Value Measurements      
Property, plant and equipment $ 46,450 $ 46,450